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Volvo B5254F specs: 149 ci 5-cylinder, 83 x 90 mm (3.2677 x 3.5433 in) bore and stroke, 10.5:1 compression. Built 1993–1997. Used in the Volvo 850.
The Volvo B5254F is undersquare — the 3.5433" stroke exceeds the 3.2677" bore by 7.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5433" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 5 cylinders displaces 29.8 ci (488 cc).
10.5:1 is in the range that usually runs on pump premium.
It is one of 5 engines in the Volvo 149ci family, all of them 149 ci — the differences between them are in compression, heads and rating, not displacement. 5 factory variants share these dimensions across 1993–1997.
| Displacement | 149 ci |
|---|---|
| Bore | 3.2677" |
| Stroke | 3.5433" |
| Cylinders | 5 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.922 |
| Fuel type | gas |
|---|---|
| Years | 1993–1997 |
| Bore/stroke character | 0.922 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 29.8 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1993 | — | B5254F |
| 1994 | — | B5254F |
| 1995 | — | B5254F |
| 1996 | — | B5254F |
| 1997 | — | B5254F |
1 factory vehicle, 1993–1997. Each year opens that model's engine table.